AirHint found the following cheapest one-way flights from Chiang Mai (CNX) to Lisbon (LIS) in December 2025 (see full year).
One-Way flights
| 04 Dec | Nok Air | ||
| 18 Dec | Thai AirAsia | ||
| 17 Dec | Thai AirAsia | ||
| 01 Dec | Etihad Airways | ||
| 19 Dec | Nok Air |
Also check the deals for return flights from Chiang Mai to Lisbon in December.
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